摘要
在软岩巷道锚杆支护中,采用传统冷轧工艺生产的中空锚杆,由于其低延伸率与围岩变形不协调,易造成锚杆失效和巷道失稳。为提高锚杆的延伸率,同时保证强度,从锚杆的轧制工艺出发,改进传统的冷轧工艺为感应加热温轧工艺。以材质40Cr的D28型中空锚杆体为例,将冷轧和感应加热温轧工艺下的力学性能试验数据进行对比。结果表明：冷轧工艺下D28型锚杆的抗拉力为350~370 k N,抗拉强度为900~950MPa,延伸率为8%~9%;温轧工艺下D28型锚杆的抗拉力为340~360 k N,抗拉强度为800~900 MPa,延伸率为12%~16%。二者相比,感应加热温轧工艺下锚杆在保持原有高强度的同时,延伸率显著提高。因此,在软岩巷道支护中,采用感应加热温轧工艺加工的中空锚杆,更能有效控制围岩稳定。
Hollow bolts which are made under traditional cold roiling process are widely used in soft rock roadway bolting, but for its low elongation rate which is not in harmony with the surrounding rock deformation, bolt failure and roadway instability are easily happened. To improve the elongation rate of the bolt, meanwhile, to ensure its strength, the traditional cold rolling technics was improved to be warm rolling and induction heating. Taking 40Cr material for the D28 hollow bolt for example,the test data under the two different tech- nology process were compared. The results show that ：tensile force of cold rolling D28 bolt is 350 - 370 kN,tensile strength is 900 - 950 MPa, the elongation rate is about 8% - 9% ;tensile force of warm rolling process D28 bolt is 340 -360 kN ,tensile strength is 800 - 900 M Pa,the elongation rate is about 12% ,48 - 16%. In comparison, the elongation rate of bolts with warm-rolling process was signifi- cantly increased while maintaining the original high strength. Therefore, in bolt supporting in soft rock roadway, it can effectively control surrounding rock using hollow bolts which is made under warm-rolling process.
出处
《中州煤炭》
2014年第12期11-13,共3页
Zhongzhou Coal
关键词
中空锚杆
冷轧工艺
感应加热
温轧工艺
力学性能
hollow bolt
cold rolling
induction heating
warm rolling
mechanical experiment
